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Spatio-spectral 4D coherent ranging using a flutter-wavelength-swept laser. [PDF]
Nat CommunJeong D +7 more
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Genetic diversity and spread dynamics of SARS-CoV-2 variants present in African populations. [PDF]
R Soc Open SciMtetwa D, Manjengwa T, Chikwambi Z.
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PROBLEMS OF HIGH-SPEED RAIL FLAW DETECTION
Kontrol'. Diagnostika, 2021The main factors that reduce the quality of non-destructive testing of rails during high-speed scanning are considered. The most significant factors are the quality and volume of obtaining primary information about the condition of the monitored rails. It is shown that, at high-speed (up to 120 km/h) control, the compression of the defect location zone
A. A. Markov, E. A. Maksimova
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Deep Autoencoder for Ultrasound-Based Rail Flaw Detection
2022 Joint Rail Conference, 2022Abstract Safety is the principal concern of the railway industry, and rail internal defects can pose significant risks to safe and efficient railroad operations. Effective rail flaw detection, especially for transverse defects, is critical to prevent accidents and derailments due to broken rails.
Yuning Wu, Xuan Zhu, Jay Baillargeon
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Vibration Signal Analysis For Rail Flaw Detection
2019 CAA Symposium on Fault Detection, Supervision and Safety for Technical Processes (SAFEPROCESS), 2019Rails are the foundation of rail transport, and any defects of the rails may directly affect the running state of the train or even lead to major safety incidents. However, the existing algorithms for rail crack detection are too expensive and difficult to perform on-line real-time monitoring.
Bin Li +3 more
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A FPGA based ultrasonic rail flaw detection system
2017 IEEE International Symposium on Signal Processing and Information Technology (ISSPIT), 2017Ultrasonic testing is one of the main methods used for rail flaw detection. In order to detect the flaw in different positions in the rail and increase the detecting accuracy, multiple ultrasonic probes are needed. It is difficult for real time detecting when the rail testing vehicle runs at a high speed.
Wei Li, Houxiang Zhang
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The optimization of transducer layout in rail flaw detection
2015 IEEE Far East NDT New Technology & Application Forum (FENDT), 2015The railway is a kind of large volume public transportation, and more and more attention is paid to the safety of rails nowadays. As the rail is subject to heavy cyclic loads of trains, it is easily broken in the long-term operations, and this will seriously affect the safety of the trains. As an important rail flaw detection method, ultrasonic testing
Lei Zhang +3 more
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Non-contact rail flaw detection system: first field test
SPIE Proceedings, 2007Researchers at UCSD, with the initial support of NSF and the current support of the Federal Railroad Administration (FRA), have been working on a flaw detection prototype for rails that uses non-contact ultrasonic probing and robust data processing algorithms to provide high speed and high reliability defect detection in these structures. Besides the
Piervincenzo Rizzo +4 more
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Application of FTP in flaw detection of rail web
Optik, 2014Abstract In this paper, the author aims to use the Fourier transform profilometry, a three-dimensional non-contact optical measurement method, for recovering the rail profile and defects on the rail web. The deformed fringe pattern, caused by the uneven distribution of the surface's height when a Ronchi grating is projected onto the rail's surface ...
Sheng-xi He +3 more
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